How to reference a bound column from RowUpdating of GridView control

Dear Experts,
I have a GridView I use for tracking shift times in a time clock application. If a user edits a row, I want to track the changes. In the RowUpdating event of the GV, I am simply trying to reference a bound column ("STShiftTimeID") to pass to my update table. I have tried:
DirectCast(gvShiftTimes.FindControl("STShiftTimeID"),Label) - using STShiftTime as a bound column;
DirectCast(gvShiftTimes.FindControl("txtSTShiftTimeID"),TextBox) - using txtSTShiftTimeID as a text box in a template and keep getting the NullReferenceException error. I have checked spelling and no typos.
I also check the e.Keys, e.NewValues, and e.OldValues of the Time-In and Time-Out controls, which work fine. If I try to find the STShiftTimeID value using either of those e values, it just comes back as zero, though I can see the STShiftTimeID in the grid.
So Experts, please, how do I reference the STShiftTimeID in my gridview control?
Thank you.
Dim tbxSTShiftTimeID As TextBox = CType(gvShiftTimes.FindControl("txtSTShiftTimeID"), TextBox)
        Dim iShiftTimeID As Integer = 0
        If tbxSTShiftTimeID.Text IsNot Nothing Then
            iShiftTimeID = tbxSTShiftTimeID.text
        End If

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MCallasAsked:
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prairiedogCommented:
Change this line to the attached snippet:
Dim tbxSTShiftTimeID As TextBox = CType(gvShiftTimes.FindControl("txtSTShiftTimeID"), TextBox)
 

Dim row As GridViewRow = Me.gvMemberLogs.Rows(e.RowIndex)
Dim tbxSTShiftTimeID As TextBox = CType(row.FindControl("txtSTShiftTimeID"), TextBox)

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prairiedogCommented:
Sorry, change "gvMemberLogs" to "gvShiftTimes"
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MCallasAuthor Commented:
Thanks, prairiedog, for your quick and accurate reply (and for restoring what was left of my sanity).
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